Why, Flashfire?

I was trying to flash stock firmware (.tar.md5) with FlashFire directly on my Star 2+ (SM-G350E), everything went correctly, but suddently, after flashing modem and system, the phone rebooted, then stucked forever on splash screen... I went to download mode, and always find current bin and system status CUSTOM... I only have stock recovery...
Have anyone else faced that problem? Thanks ij advance.
PS: Almost the same problem occured to my S5 mini, just beginned flashing system and rebooted itself on sammy logo forever.. Fixed with odin..

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